Radiative lifetimes and oscillator strengths for $2 s - 2 p$ transitions in He-, Li-, and Be-like iron

1 July 1984

journal article
research article
Published by American Physical Society (APS) in Physical Review A

Vol. 30 (1) , 309-315
https://doi.org/10.1103/physreva.30.309

Abstract

Lifetimes of

n = 2

levels in two-, three-, and four-electron ions

{Fe}^{24 +}

{Fe}^{23 +}

and

{Fe}^{22 +}

have been determined using the beam-foil method. The measured decay at 271 Å confirms our identification of this line with the

2 s {}^{3}S_{1} - 2 p {}^{3}P_{2}

heliumlike Fe xxv. Oscillator strengths derived from the

2 s {}^{2}S_{\frac{1}{2}} - 2 p {}^{2}P_{\frac{1}{2}, \frac{3}{2}}

resonance transitions in lithiumlike Fe xxiv results are in good agreement with multiconfiguration Hartee-Fock (MCHF) length gauge calculations. Strong cascading from

2 p^{2} {}^{1}S_{0}

and

2 p^{2} {}^{1}D_{2}

have been measured and used in the analysis of the complex decay of the resonance transition in berylliumlike Fe xxiii, removing the discrepancy between the experimental and theoretical

f

value which has been observed for the

2 s^{2} {}^{1}S_{0} - 2 s 2 p {}^{1}P_{1}

transition in some ions of the Be sequence. Experimental lifetimes and oscillator strengths are compared with theoretical data from MCHF and other relativistic calculations.

Keywords

This publication has 21 references indexed in Scilit:

Comparison of Theoretical and Experimental Level Values of then= 2 Complex in Ions Isoelectronic with Li, Be, O and F
Physica Scripta, 1983
Les transitions 2s 3S — 2p 3P des ions heliumoïdes lourds: Cas du Fe XXV
Nuclear Instruments and Methods in Physics Research, 1982
Lifetime measurements of the3 P 2 and4 P 5 2/0 states in He- and Li-like titanium and chromium
The European Physical Journal A, 1982
MCDF calculations of wavelengths and radiative lifetimes in helium-like ions
Journal of Physics B: Atomic and Molecular Physics, 1981
Wavelength measurement of the $1 s 2 s {}^{3}S_{1} - 1 s 2 p {}^{3}P_{2}$ transition in heliumlike ${Fe}^{24 +}$
Physical Review A, 1981
The analysis of the n=2-2 transitions in the XUV spectra of Cr to Ni
Journal of Physics B: Atomic and Molecular Physics, 1980
Theoretical lifetimes and fluorescence yields for 1s2p 3P levels
Physics Letters A, 1980
Transition Probabilities for Allowed and Forbidden Transitions From the 1s2p³P Levels in He-like O VII and F VIII
Physica Scripta, 1980
Radiative decays of the $n = 2$ states of He-like ions
Physical Review A, 1977
Radiative Decay of the $2 {}^{3}S_{1}$ and $2 {}^{3}P_{2}$ States of Heliumlike Vanadium ( $Z = 23$ ) and Iron ( $Z = 26$ )
Physical Review Letters, 1974

Radiative lifetimes and oscillator strengths for2s−2ptransitions in He-, Li-, and Be-like iron

Abstract

Keywords

Radiative lifetimes and oscillator strengths for $2 s - 2 p$ transitions in He-, Li-, and Be-like iron